CN114276111B - Non-expansive ardealite fireproof coating - Google Patents
Non-expansive ardealite fireproof coating Download PDFInfo
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- CN114276111B CN114276111B CN202210063796.XA CN202210063796A CN114276111B CN 114276111 B CN114276111 B CN 114276111B CN 202210063796 A CN202210063796 A CN 202210063796A CN 114276111 B CN114276111 B CN 114276111B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a non-expansive ardealite fireproof coating, which belongs to the technical field of building fireproof materials and comprises the following components in parts by weightThe composition is as follows: 65-70 parts of phosphogypsum, 8-10 parts of heat insulation aggregate, 10-15 parts of fireproof light filling material, 2-3 parts of reinforcing fiber, 1-3 parts of redispersible latex powder, 0.1-0.3 part of water-retaining agent, 0.1-0.2 part of gypsum retarder, 1-2 parts of fly ash and 1-2 parts of pH regulator; the steel structure fireproof coating provided by the invention has the advantages that the mixing amount of phosphogypsum is increased, the phosphogypsum is fully utilized, and the volume weight of the fireproof coating is lower than 500kg/m 3 (ii) a In performance, under the condition that the thickness of the coating is 25-30mm, the fire resistance limit is more than or equal to 4 hours, and the bonding strength with a steel structure is more than or equal to 0.5Mpa, so that the fireproof performance is obviously improved, and the durability is improved; moreover, the paint is single-component, powdery, can be sprayed by a machine during construction, and is simple in construction and high in efficiency.
Description
Technical Field
The invention relates to the technical field of building fireproof materials, in particular to a non-expansive ardealite fireproof coating.
Background
The steel structure has the advantages of light dead weight, high strength, good earthquake resistance, convenient industrial production, high construction speed and the like, and is widely applied to indoor and outdoor buildings.
However, one of the most important disadvantages of the steel structure is poor fire resistance, reduced strength and creep under high temperature conditions. For the constructional steel, the strength is unchanged below 260 ℃, and the strength begins to decline at 260-280 ℃; when the temperature reaches 400 ℃, the yield phenomenon disappears, and the strength is obviously reduced; when the temperature reaches 450-500 ℃, the internal recrystallization of the steel material leads the strength to be rapidly reduced; with further increase of temperature, the bearing capacity of the steel structure will be lost. Creep also occurs at lower temperatures, but creep is more pronounced at higher temperatures. In recent years, large-area collapse occurs in 15-20 min in fire of steel structure buildings without effective fire protection measures. Therefore, in order to prevent and reduce the fire hazard of the building steel structure and protect the personal safety and property safety of users and fire rescue workers, scientific fire protection measures must be carried out on the steel structure.
The fireproof coating is simple and convenient to construct and is not limited by the geometric shape of a steel member, so that the fireproof coating has better economical efficiency and adaptability and is widely adopted. The non-expansion (thick coating) steel structure fireproof coating is safe, reliable, green and environment-friendly, and is a fireproof coating which is greatly promoted by scientific research units, supervision departments and market main bodies.
At present, there are reports on fire-retardant coatings for steel structures.
Phosphogypsum is a solid waste generated in a wet-process phosphoric acid process, the components of the phosphogypsum are mainly calcium sulfate dihydrate, and the random discharge and accumulation of the phosphogypsum seriously damages the ecological environment, not only pollutes underground water resources, but also causes the waste of land resources, so the recycling of the phosphogypsum is also an important subject in the field of buildings. At present, about 40 percent of phosphogypsum is used for steel structure fireproof coating, and the utilization ratio of the phosphogypsum is only about 40 percent, so the utilization efficiency is low. The reason for this is probably because the volume weight of the phosphogypsum raw material is larger, generally 1000kg/m 3 About, and the volume weight standard of the prior art for the steel structure fireproof coating is less than 500kg/m 3 Therefore, if the proportion of the phosphogypsum exceeds 40%, the volume weight of the prepared fireproof coating cannot reach the standard.
In addition, the inventors have demonstrated through numerous experiments: if the proportion of the phosphogypsum is small, the fireproof performance, the bonding strength and the like of the phosphogypsum are also low. The Chinese patent publication No. CN 113072358A with the invention name 'phosphogypsum-based fireproof plastering mortar for steel tube bundle shear walls' discloses fireproof plastering mortar with the phosphogypsum mixing amount of more than 85 percent, and although the phosphogypsum mixing amount is greatly improved, the specification discloses that the volume weight of the obtained fireproof plastering mortar is less than 500kg/m 3 However, in order to reach the volume weight, the water-material ratio is as high as 0.7-09, so that the strength is very low, for example, the bonding strength is only 0.04Mp, which is obviously lower, and the durability of the fireproof coating is not good.
Disclosure of Invention
The invention aims to provide a non-expansive ardealite fireproof coating to solve the problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the non-expansive ardealite fireproof coating consists of the following components in parts by weight:
65-70 parts of phosphogypsum, 8-10 parts of heat insulation aggregate, 10-15 parts of fireproof light filling material, 2-3 parts of reinforcing fiber, 1-3 parts of redispersible latex powder, 0.1-0.3 part of water-retaining agent, 0.1-0.2 part of gypsum retarder, 1-2 parts of fly ash and 1-2 parts of pH regulator.
Through a large number of experiments, the inventor of the application makes full use of 2 crystal waters (CaSO) contained in phosphogypsum 4 .2H 2 O) can release crystal water to form water mist when meeting high temperature, thereby playing a better fireproof role. In addition, the invention ensures that the volume weight of the steel structure fireproof coating is 500kg/m by adding a proper amount of fireproof light filling materials 3 On the premise that the content of the used phosphogypsum reaches about 70 percent, and has positive effect on the comprehensive utilization of the phosphogypsum. The invention adds 8-10 components of heat insulation aggregate on the basis of the dosage of the high-doping-amount phosphogypsum, and the heat insulation aggregate and the phosphogypsum cooperate to effectively reduce and prolong the damage to a steel structure when blocking high temperature in case of fire, and the fire resistance limit of a sample is detected to be more than or equal to 4 hours, so that the non-expansion type steel structure fireproof coating can not generate smoke and has better fireproof performance in case of fire under the common combination of the high-doping-amount phosphogypsum heat insulation aggregate and the fireproof light filling material. The non-expansion type steel structure fireproof coating is a single component, is powdery, can be sprayed by a machine during construction, and is simple and efficient in construction. Because the phosphogypsum is acidic, a proper amount of pH value regulator is added, the pH value of the fireproof coating is regulated to be more than or equal to 7, namely the fireproof coating is neutral and weakly alkaline, and the corrosion of the steel structure caused by the acidity of the phosphogypsum is avoided; according to the invention, by adding a proper amount of redispersible latex powder and cooperating with other components, the bonding strength with a steel structure is obviously enhanced, and the bonding strength of a sample is detected to be more than or equal to 0.5Mpa.
The improvement of the bonding strength of the invention benefits from the combined action of several materials: comprises re-dispersible latex powder, fly ash, mica powder and a retarder; wherein, the retarder increases the coagulation time and improves the hydration efficiency; the mica powder improves the adhesive force of the material; the addition of the fly ash improves the strength and porosity of the material; the latex powder has excellent adhesive force, the cohesive force of the material is increased by adding the latex powder, although the adhesive strength can be improved by adding the latex powder, the compression strength and other indexes of the material can be reduced by using too high amount of the latex powder, and the design of the material proportion is a dynamic balance.
The invention can effectively utilize the phosphogypsum, is beneficial to the nation and the people, and is a concrete expression for implementing various policies of 'ecological civilization construction and ecological environment protection' in China.
As a preferred technical scheme: the heat insulation aggregate is mica powder. The mica powder has stable main mineral content, moderate refractoriness, insulation and heat insulation, and stable physicochemical properties; the mud has the advantages of good cohesiveness, no expansion, high drying speed, good plasticity, strong iron flow scouring resistance and the like.
As a preferred technical scheme: the fire-resistant light filling material is floating beads. The floating bead is a vacuum glass state hollow microsphere capable of floating on the water surface, has various characteristics of fine particles, hollowness, light weight, high strength, wear resistance, high temperature resistance, heat insulation, flame retardance and the like, is one of raw materials widely applied to the fire-resistant industry, and is used as the phosphogypsum fire-retardant coating.
As a preferred technical scheme: the reinforcing fiber is aluminum silicate fiber. The aluminium silicate fiber, also called ceramic fiber, is a new type of light refractory material, and has the advantages of light volume weight, high temperature resistance, good thermal stability, low thermal conductivity, small heat capacity, good mechanical vibration resistance, small thermal expansion, good heat insulation performance, etc.
As a preferred technical scheme: the redispersible latex powder is vinyl acetate/ethylene copolymer.
As a preferred technical scheme: the water-retaining agent is hydroxypropyl methyl cellulose ether.
The fireproof coating has the advantages that the water-material ratio is controlled to be about 0.66 when the fireproof coating is used, the proper water-material ratio is matched with a proper amount of other ingredients, the volume weight and the strength of the material can be considered under the condition of large mixing amount of phosphogypsum, the bonding strength is improved by nearly ten times compared with the prior art under the condition of standard volume weight, and the durable durability of the material is greatly facilitated.
Compared with the prior art, the invention has the advantages that: the steel structure fireproof coating disclosed by the invention improves the mixing amount of the phosphogypsum and fully utilizes the phosphogypsum on the basis of raw material composition, and ensures that the volume weight of the fireproof coating is lower than 500kg/m 3 (ii) a In performance, under the condition that the thickness of the coating is 25-30mm, the fire resistance limit is more than or equal to 4 hours, and the bonding strength with a steel structure is more than or equal to 0.5Mpa, so that the fireproof performance is obviously improved, and the durability is improved; and the coating is a single component, is powdery, can be sprayed by a machine during construction, and is simple and high in efficiency.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The non-expansive ardealite fireproof paint consists of the following raw materials in parts by weight:
65 parts of phosphogypsum, 8 parts of mica powder, 10 parts of floating beads, 2 parts of aluminum silicate fibers, 1 part of vinyl acetate/ethylene copolymer, 0.1 part of hydroxypropyl methyl cellulose ether, 0.1 part of protein retarder, 1 part of fly ash and 1 part of pH regulator;
the preparation method comprises the following steps:
weighing the raw materials according to the parts by weight, uniformly mixing all the raw materials to obtain a finished product, and bagging the finished product.
The construction method comprises the following steps:
the spraying method is adopted, namely a construction method for atomizing the coating by using compressed air and a spray gun, and when the coating is used, the water consumption is as follows: the water-to-feed ratio was 0.66, and the amount of water used in each of the following examples and comparative examples was the same as that used in this example.
Example 2
The non-expansive ardealite fireproof paint consists of the following raw materials in parts by weight:
70 parts of phosphogypsum, 10 parts of mica powder, 15 parts of floating beads, 3 parts of aluminum silicate fibers, 3 parts of vinyl acetate/ethylene copolymer, 0.3 part of hydroxypropyl methyl cellulose ether, 0.2 part of gypsum retarder, 2 parts of fly ash and 2 parts of pH regulator;
the preparation method and the construction method are the same as those of the example 1.
Example 3
The non-expansive ardealite fireproof paint consists of the following raw materials in parts by weight:
68 parts of phosphogypsum, 9 parts of mica powder, 12.5 parts of floating beads, 2.6 parts of aluminum silicate fibers, 1.5 parts of vinyl acetate/ethylene copolymer, 0.21 part of hydroxypropyl methyl cellulose ether, 0.5 part of gypsum retarder, 1.5 parts of fly ash and 1.6 parts of pH regulator;
the preparation method and the construction method are the same as those of the embodiment 1.
Comparative example 1
This comparative example is the same as example 3 except that no mica powder was added as compared with example 3.
Comparative example 2
This comparative example is the same as example 3 except that no vinyl acetate/ethylene copolymer was added as in example 3.
Comparative example 3
In this comparative example, the amount of vinyl acetate/ethylene copolymer added was 3.5 parts as compared with example 3, and the remainder was the same as in example 3.
Comparative example 4
This comparative example is the same as example 3 except that no fly ash was added as compared with example 3.
Performance test
The test of the fire resistance and the bonding strength of the embodiment is carried out according to the regulation in GB 14907-2018; detecting the equivalent conduction thermal coefficient according to GB 51249-2017; the volume weight determination is carried out according to GB/T28627-2012;
the test results are shown in Table 1
TABLE 1 results of performance test of each example and comparative example
From the test results of comparative example 1, it can be seen that the fire resistance can be improved over the prior art even without the addition of the insulation aggregate, i.e., the fire resistance can be improved not only by the addition of the insulation aggregate.
From the test results of comparative example 2, it can be seen that even without the addition of the redispersible latex powder (vinyl acetate/ethylene copolymer), the adhesive properties are higher than those of the prior art, i.e., the adhesive properties are improved, not only by the addition of the redispersible latex powder.
As can be seen from comparative example 3, if the redispersible latex powder (vinyl acetate/ethylene copolymer) is increased, the adhesive strength of the material and the substrate is increased, the breaking strength is increased, but the compressive strength is decreased; the latex powder is increased, the cohesion of the slurry is increased, the viscosity is increased, the air content of the slurry is increased, and the porosity is increased; moreover, the economy is also deteriorated, the latex powder is about 15-20 yuan per kg, the use amount of 3 percent, and the cost of the rubber powder reaches 450-600 yuan per ton of finished products.
As can be seen from comparative example 4, the fly ash has a great influence on the adhesive property of the fireproof coating, and plays an important role in improving the adhesive property, and the addition of the fly ash firstly reduces the friction force among materials due to the form of small balls, so that the water demand of the materials is reduced; secondly, fly ash is an inorganic material, the hydration product of which is also, and which forms a more compact layer of hydration product, permanently improving the bond strength (organic materials will age).
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. The non-expansive ardealite fireproof coating is characterized by comprising the following components in parts by weight:
65-70 parts of phosphogypsum, 8-10 parts of heat insulation aggregate, 10-15 parts of fireproof light filling material, 2-3 parts of reinforcing fiber, 1-3 parts of redispersible latex powder, 0.1-0.3 part of water-retaining agent, 0.1-0.2 part of gypsum retarder, 1-2 parts of fly ash and 1-2 parts of pH regulator; the redispersible latex powder is a vinyl acetate/ethylene copolymer.
2. The non-intumescent phosphogypsum fire retardant coating according to claim 1, characterized in that: the heat insulation aggregate is mica powder.
3. The non-intumescent phosphogypsum fire retardant coating according to claim 1, characterized in that: the fire-resistant light filling material is floating beads.
4. The non-intumescent phosphogypsum fire retardant coating according to claim 1, characterized in that: the reinforcing fiber is aluminum silicate fiber.
5. The non-intumescent phosphogypsum fire retardant coating according to claim 1, characterized in that: the water-retaining agent is hydroxypropyl methyl cellulose ether.
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| CN202210063796.XA CN114276111B (en) | 2022-01-20 | 2022-01-20 | Non-expansive ardealite fireproof coating |
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| CN114276111B true CN114276111B (en) | 2023-04-11 |
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| CN115011182A (en) * | 2022-07-18 | 2022-09-06 | 楚雄佑琳生科技有限公司 | Thick fireproof coating for phosphogypsum steel structure |
| CN115772339A (en) * | 2022-12-23 | 2023-03-10 | 厦门安隆达消防材料有限公司 | Non-intumescent steel structure fireproof coating composition |
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| JP3988843B2 (en) * | 1997-03-24 | 2007-10-10 | 株式会社エーアンドエーマテリアル | Wet spray fireproof coating composition |
| CN106013475B (en) * | 2016-04-16 | 2018-09-25 | 马振义 | A kind of steel house gypsum base water-proof fire-retardant goes along with sb. to guard him heat-insulation system and preparation method |
| CN107176815A (en) * | 2017-04-28 | 2017-09-19 | 杭萧钢构股份有限公司 | A kind of gypsum base steel structure fireproof protection material containing reinforcing fiber |
| CN112552719A (en) * | 2020-11-27 | 2021-03-26 | 鲁米科技(山东)有限公司 | Concrete surface fireproof heat-preservation gypsum-based fireproof coating and preparation method thereof |
| CN112679184A (en) * | 2020-12-28 | 2021-04-20 | 鲁米科技(山东)有限公司 | Gypsum-based non-intumescent fire-retardant coating for steel structure |
| CN113072358A (en) * | 2021-04-09 | 2021-07-06 | 湖北文理学院 | Phosphogypsum-based fireproof plastering mortar for steel tube bundle shear wall |
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